Critical Fluctuations and Quenched Disordered Two-Dimensional Charge Stripes in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>La</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn><mml:mi>/</mml:mi><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>/</mml:mi><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>NiO</m

Du, Chao-Hung; Ghazi, M. E.; Su, Yixi; Pape, I.; Hatton, P. D.; Brown, S. D.; Stirling, W. G.; Cooper, M. J.; Cheong, Sang‐Wook

doi:10.1103/physrevlett.84.3911

Cited by 50 publications

(66 citation statements)

References 19 publications

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“…Under the assumption that all of the measurements are probing the same CDW correlations, it has been proposed that the X-ray measurements might be integrating over fluctuating CDW correlations, which would not be detectable by NMR 48,49 . There are problems with such an interpretation, however, a recent study 50 has shown that the integrated intensity of a CDW peak in YBa 2 Cu 3 O 6.6 is quite similar to one in charge-stripe-ordered La 1 NiO 4 , our results directly demonstrate that charge-stripe fluctuations exist far above T co , whereas elastic X-ray scattering measurements 16 lost the signal by T co þ 20 K. This strongly suggests that the X-ray studies of YBa 2 Cu 3 O 6 þ x are measuring static correlations. (Note that recent inelastic X-ray scattering measurements 51 have narrowed the possible energy range of fluctuations to something less than 1 meV.)…”

Section: Discussioncontrasting

confidence: 38%

Direct observation of dynamic charge stripes in La2–xSrxNiO4

Anissimova

Parshall

et al. 2014

Nat Commun

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The insulator-to-metal transition continues to be a challenging subject, especially when electronic correlations are strong. In layered compounds, such as La 2-x Sr x NiO 4 and La 2-x Ba x CuO 4 , the doped charge carriers can segregate into periodically spaced charge stripes separating narrow domains of antiferromagnetic order. Although there have been theoretical proposals of dynamically fluctuating stripes, direct spectroscopic evidence of charge-stripe fluctuations has been lacking. Here we report the detection of critical lattice fluctuations, driven by charge-stripe correlations, in La 2-x Sr x NiO 4 using inelastic neutron scattering. This scattering is detected at large momentum transfers where the magnetic form factor suppresses the spin fluctuation signal. The lattice fluctuations associated with the dynamic charge stripes are narrow in q and broad in energy. They are strongest near the charge-stripe melting temperature. Our results open the way towards the quantitative theory of dynamic stripes and for directly detecting dynamical charge stripes in other strongly correlated systems, including high-temperature superconductors such as La 2-x Sr x CuO 4 .

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Section: Discussioncontrasting

confidence: 38%

Direct observation of dynamic charge stripes in La2–xSrxNiO4

Anissimova

Parshall

et al. 2014

Nat Commun

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“…This evidences that charge stripes undergo a second-order phase transition. This is consistent with our previous report of a quenched disordered charge stripes [22]. According to our model, this quenched disordered state is the consequence of the interplay between charges and spins.…”

Section: (E)supporting

confidence: 82%

“…Finally, the interlayer charge correlation length reaches ξ = ∼10Å below T = 218 K, where both the charge and spin stripes are well established. We realize, for the c-axis correlation length at low temperatures, that there exists a discrepancy between the current data and the reported result [22]. This difference could be due to the different sample treatments as those reported by Hücker et al [21].…”

Section: (E)contrasting

confidence: 54%

“…Cooling from high temperatures, the charge correlation starts to build up significantly along the c axis of the crystal at around T = 238 K, and the charge correlation lengths start to increase from ξ = ∼6Å to 14Å as temperature is cooled down to T = 230 K. At this temperature, the interlayer charge correlation spans over two NiO layers and it seems that a full 3D ordering will eventually develop if there is no existence of any imperfections in the crystal [22]. However, when the temperature is further decreased, the interlayer charge correlation starts to decrease, rather than increase, and the inverse order-disorder transition occurs.…”

Section: (E)mentioning

confidence: 99%

“…Compared with PNSO and NSNO, LSNO shows no orthorhombic strain, so the stacking fault is expected to have the less effect on governing the interlayer coupling, however, the similar behavior for spin stripes would be expected if the stacking fault of NiO 2 layers is the major driving face for the formation of inverse orderdisorder. Interlayer Coulomb interaction has been argued to be crucial in understanding an anomalous shrinking of the c/a lattice parameter ratio that correlates with T CO in La 1.67 Sr 0.33 NiO 4 [20], as well as the existence of fluctuating charge stripes that persist to high temperatures [20,22]. In particular, the inverse order-disorder transition of the interlayer charge order observed in this work may provide a new direction to understand the dominance of the dynamical stripes in cuprates.…”

Section: (E)mentioning

confidence: 99%

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Inverse order-disorder transition of charge stripes

Lee

Lai

et al. 2015

Phys. Rev. B

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We report an unusual transition behavior of charge stripes in La 1.67 Sr 0.33 NiO 4 using x-ray scattering. The segregated holes in La 1.67 Sr 0.33 NiO 4 are observed to form anisotropic stripes in the a × b plane of the crystal space below the transition temperature T 238 K, and at the same time, display an unusual inverse order-disorder transition along the c axis. Using a phenomenological Landau theory, we show that this inverse transition is due to the interlayer coupling between the charge and spin orders. This discovery points to the importance of the interlayer correlations in the strongly correlated electrons system. Doped Mott insulators have served as a rich playground for strongly correlated electron systems, yet the physics is still not fully comprehended. The complexity results from the interplay between competing orders, such as charge, spin, orbital, and lattice, and the strong quantum fluctuations [1]. In the model system of high-T c superconductor La 2 CuO 4 , substitution of La with Sr or Ba induces segregated holes that form unidirectional self-organized electronic stripes in the a × b plane of the crystal space [2]. Experimentally, such a phenomenon has been observed in neutron, x-ray, and electron diffractions, and it is shown that transport behavior depends strongly on the hole concentration [3,4]. These ordered electronic phases are understood to arise due to the Coulomb-frustrated separation of electronic domains at the nanoscale [5,6]. In these phases, there exist locally Mott insulating regions with magnetic (spin) order, separated by more metallic regions with higher concentrations of doped holes. Taking the in-plane fluctuations into consideration, these ordered charges could form the exotic electronic liquid-crystal phases [7,8]. This intralayer coupling between the ordered charges and spins has been widely discussed and observed in Cu-and Fe-based * chd@mail.tku.edu.tw † yjkao@phys.ntu.edu.tw superconductors [9][10][11][12]. It is natural to ask what role the interlayer coupling between the charge and spin orders in different planes plays in these systems [13,14].Using x-ray scattering measurements on single-crystal samples of La 2−x Sr x NiO 4 (LSNO), we report an unusual inverse order-disorder transition due to the interlayer coupling of the in-plane charges and spins. It is well established that there can exist both smectic and striped-liquid phases of in-plane charge and spin ordering in LSNO [15][16][17][18]. LSNO has a tetragonal structure [ Fig. 1(a)], and is isostructural with the superconducting cuprate LSCO. Both LSNO and LSCO are antiferromagnetic (AFM) Mott insulators in the absence of hole doping. While LSCO becomes a high-T c superconductor for small amounts of hole doping, LSNO remains insulating for doping levels of up to 90% [19].In LSNO the doped holes condense, leaving, within each two-dimensional (2D) NiO layer, an alternating pattern of AFM domains (spin stripes) separated by charge stripes [ Fig. 1(b)]. In the reciprocal space of the tetragonal crystal structur...

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Jahn‐Teller distortion ordering in single‐crystal Nd _1/2 Sr _1/2 MnO ₃

Ghazi

Hatton

2004

phys. stat. sol. (c)

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Charge, spin and orbital degrees of freedom play important roles in the electrical and magnetic properties of manganites. Nd 0.5 Sr 0.5 MnO 3 is a paramagnetic insulator with Imma orthorhombic symmetry at room temperature. Upon cooling it becomes a ferromagnetic metal below 240 K and at 160 K undergoes a firstorder phase transition. Below this temperature it is a CE-type antiferromagnetic insulator. In this paper we report synchrotron X-ray scattering investigations of superlattice reflections observed in the low temperature phase of Nd 0.5 Sr 0.5 MnO 3 . Upon cooling below 160 K we observed additional peaks occurring at noninteger positions in reciprocal space. These reflections had a wavevector (1/2, 0, 0) and are due to the structural modulation arising from the Jahn-Teller distortion associated with charge ordering of Mn 3+ and Mn 4+ ions and orbital ordering in the sample. The peaks observed below 160 K have an intensity of approximately 10 -3 that of the Bragg reflections. The intensity profiles of these reflections show that the transition into the ordered phase is strongly first-order. The structural phase transition was observed to display a hysteresis width of 10 K. The measured widths of these peaks show that the charge modulation is correlated primarily in the ac plane rather than the K-direction (long-axis).

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Critical Fluctuations and Quenched Disordered Two-Dimensional Charge Stripes inLa5/3Sr1/3NiO

Cited by 50 publications

References 19 publications

Direct observation of dynamic charge stripes in La2–xSrxNiO4

Direct observation of dynamic charge stripes in La2–xSrxNiO4

Inverse order-disorder transition of charge stripes

Jahn‐Teller distortion ordering in single‐crystal Nd _1/2 Sr _1/2 MnO ₃

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Critical Fluctuations and Quenched Disordered Two-Dimensional Charge Stripes inLa5/3Sr1/3NiO

Cited by 50 publications

References 19 publications

Direct observation of dynamic charge stripes in La2–xSrxNiO4

Direct observation of dynamic charge stripes in La2–xSrxNiO4

Inverse order-disorder transition of charge stripes

Jahn‐Teller distortion ordering in single‐crystal Nd 1/2 Sr 1/2 MnO 3

Contact Info

Product

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Jahn‐Teller distortion ordering in single‐crystal Nd _1/2 Sr _1/2 MnO ₃